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<head><meta charset="utf-8"><title>weekly meeting 2020-04-16 #54818 · t-compiler · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/index.html">t-compiler</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html">weekly meeting 2020-04-16 #54818</a></h3>

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<a name="194203593"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194203593" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194203593">(Apr 15 2020 at 17:54)</a>:</h4>
<p>Hi <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span>; the triage meeting will be starting in 20 hours 5 minutes</p>



<a name="194203876"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194203876" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194203876">(Apr 15 2020 at 17:56)</a>:</h4>
<p>The <span class="user-group-mention" data-user-group-id="2403">@WG-prioritization</span> will be doing pre-triage in <a class="stream-topic" data-stream-id="227806" href="/#narrow/stream/227806-t-compiler.2Fwg-prioritization/topic/pre-meeting.20triage.202020-04-16.20.2354818">#t-compiler/wg-prioritization &gt; pre-meeting triage 2020-04-16 #54818</a></p>



<a name="194203906"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194203906" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194203906">(Apr 15 2020 at 17:57)</a>:</h4>
<p>most of the prioritization work is being done async currently but this will be the sync part of the process</p>



<a name="194203992"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194203992" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194203992">(Apr 15 2020 at 17:57)</a>:</h4>
<p>we will have <span class="user-group-mention" data-user-group-id="1095">@T-compiler/WG-meta</span> and <span class="user-group-mention" data-user-group-id="1162">@WG-mir-opt</span> checkins</p>



<a name="194204151"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194204151" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194204151">(Apr 15 2020 at 17:59)</a>:</h4>
<p>there is an error in the logic of the checkins selection so some working groups had checkins recently, I think meta had one recently, anyway <span class="user-mention" data-user-id="116009">@nikomatsakis</span> do you think we need to provide an update?</p>



<a name="194204195"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194204195" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194204195">(Apr 15 2020 at 17:59)</a>:</h4>
<p><span class="user-mention" data-user-id="124288">@oli</span> can you provide the checkin tomorrow for @<em>_WG-mir-opt</em>?</p>



<a name="194204253"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194204253" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194204253">(Apr 15 2020 at 17:59)</a>:</h4>
<p>huh has that much time passed already</p>



<a name="194204333"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194204333" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194204333">(Apr 15 2020 at 18:00)</a>:</h4>
<p>I'll build a summary</p>



<a name="194204445"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194204445" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194204445">(Apr 15 2020 at 18:01)</a>:</h4>
<p><span class="user-mention silent" data-user-id="124288">oli</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194204253" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194204253">said</a>:</p>
<blockquote>
<p>huh has that much time passed already</p>
</blockquote>
<p>(i think the schedule got distorted when a new WG was added a week or two ago, and we don't have a plan to fix the design bug in the scheduling software that causes that distortion.)</p>



<a name="194204699"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194204699" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194204699">(Apr 15 2020 at 18:02)</a>:</h4>
<p>yeah, feel free to just skip this one</p>



<a name="194204767"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194204767" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194204767">(Apr 15 2020 at 18:03)</a>:</h4>
<p><span class="user-group-mention" data-user-group-id="2403">@WG-prioritization</span> will be building the <a href="https://hackmd.io/eNrDT32CTBmGxOqIb6g3Lw?view" title="https://hackmd.io/eNrDT32CTBmGxOqIb6g3Lw?view">agenda</a></p>



<a name="194204944"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194204944" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194204944">(Apr 15 2020 at 18:04)</a>:</h4>
<p>ok, let's skip</p>



<a name="194305034"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194305034" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194305034">(Apr 16 2020 at 13:37)</a>:</h4>
<p><span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span> triage meeting is starting in 23 minutes</p>



<a name="194308281"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308281" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308281">(Apr 16 2020 at 14:01)</a>:</h4>
<p>Hi <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span>! Add a <span aria-label="wave" class="emoji emoji-1f44b" role="img" title="wave">:wave:</span> emoji to show you're here :)</p>



<a name="194308328"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308328" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308328">(Apr 16 2020 at 14:01)</a>:</h4>
<p>We'll start off with five minutes for ...</p>



<a name="194308333"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308333" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308333">(Apr 16 2020 at 14:01)</a>:</h4>
<h2>Announcements</h2>



<a name="194308343"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308343" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308343">(Apr 16 2020 at 14:01)</a>:</h4>
<ul>
<li><code>perf.rust-lang.org</code> now includes <a href="https://github.com/rust-lang/rustc-perf/pull/645#issuecomment-614360211" title="https://github.com/rust-lang/rustc-perf/pull/645#issuecomment-614360211">https://github.com/rust-lang/rustc-perf/pull/645#issuecomment-614360211</a><br>
and we're already seeing greatly reduced noise from it: <a href="https://github.com/rust-lang/rust/issues/69060#issuecomment-614552799" title="https://github.com/rust-lang/rust/issues/69060#issuecomment-614552799">https://github.com/rust-lang/rust/issues/69060#issuecomment-614552799</a></li>
</ul>



<a name="194308368"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308368" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308368">(Apr 16 2020 at 14:01)</a>:</h4>
<ul>
<li>I just accidentally ate moldy bread, so wish me luck for getting through this meeting.</li>
</ul>



<a name="194308463"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308463" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308463">(Apr 16 2020 at 14:02)</a>:</h4>
<p>if you see any  <em>query count</em> differences in a run that shouldn't affect query counts, please let us know</p>



<a name="194308517"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308517" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308517">(Apr 16 2020 at 14:02)</a>:</h4>
<p>the main source of them has been <code>-C metadata</code> differences between the two compilers, which we've alleviated, we believe</p>



<a name="194308537"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308537" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308537">(Apr 16 2020 at 14:02)</a>:</h4>
<p>(we = <span class="user-mention" data-user-id="116122">@simulacrum</span> and I, I mean)</p>



<a name="194308605"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308605" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308605">(Apr 16 2020 at 14:03)</a>:</h4>
<p>and enjoy the (hopefully) more useful perf experience <span aria-label="grinning face with smiling eyes" class="emoji emoji-1f601" role="img" title="grinning face with smiling eyes">:grinning_face_with_smiling_eyes:</span></p>



<a name="194308630"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308630" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308630">(Apr 16 2020 at 14:03)</a>:</h4>
<ul>
<li>Next Thursday, April 23rd we are releasing 1.43</li>
</ul>



<a name="194308745"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308745" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308745">(Apr 16 2020 at 14:04)</a>:</h4>
<ul>
<li><a href="https://github.com/rust-lang/rfcs/pull/2904" title="https://github.com/rust-lang/rfcs/pull/2904">MCP RFC is pending</a>, still needs a few checks, but I have some edits to incorporate</li>
</ul>



<a name="194308749"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308749" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308749">(Apr 16 2020 at 14:04)</a>:</h4>
<p>so that means we have less than a week left to try to get in any further stable-to-beta backports</p>



<a name="194308779"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308779" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308779">(Apr 16 2020 at 14:04)</a>:</h4>
<ul>
<li>Automate compiler development <a href="https://github.com/rust-lang/compiler-team/issues/272" title="https://github.com/rust-lang/compiler-team/issues/272">#272</a></li>
</ul>



<a name="194308797"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308797" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308797">(Apr 16 2020 at 14:04)</a>:</h4>
<ul>
<li>We have <code>@rustbot seconded</code> support (this was meant to be sub-bullet of previous bullet)</li>
</ul>



<a name="194308872"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308872" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308872">(Apr 16 2020 at 14:05)</a>:</h4>
<p>(and new mcp proposals will file a major-change topic automatically)</p>



<a name="194308882"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308882" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308882">(Apr 16 2020 at 14:05)</a>:</h4>
<p>Ah, cool, I'll update the RFC to mention that</p>



<a name="194308928"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308928" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308928">(Apr 16 2020 at 14:05)</a>:</h4>
<p>in <a class="stream" data-stream-id="233931" href="/#narrow/stream/233931-t-compiler.2Fmajor-changes">#t-compiler/major changes</a> btw</p>



<a name="194308953"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194308953" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194308953">(Apr 16 2020 at 14:05)</a>:</h4>
<p>interested parties, probably T-compiler, should subscribe to that stream probably</p>



<a name="194309124"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309124" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309124">(Apr 16 2020 at 14:06)</a>:</h4>
<p>okay, lets see: today's <a href="https://hackmd.io/eNrDT32CTBmGxOqIb6g3Lw?both" title="https://hackmd.io/eNrDT32CTBmGxOqIb6g3Lw?both">agenda is here</a></p>



<a name="194309155"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309155" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309155">(Apr 16 2020 at 14:06)</a>:</h4>
<p>for others: if there's similar type of things where you want to get pinged on some label being added or similar, please let me know (PM or in <a class="stream" data-stream-id="224082" href="/#narrow/stream/224082-t-release.2Ftriagebot">#t-release/triagebot</a>)</p>



<a name="194309222"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309222" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309222">(Apr 16 2020 at 14:07)</a>:</h4>
<p><span class="user-mention" data-user-id="116122">@simulacrum</span> sounds like this could fit well with the "experts" ideas</p>



<a name="194309244"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309244" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309244">(Apr 16 2020 at 14:07)</a>:</h4>
<p>lets move on to <a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=label%3Abeta-nominated+label%3AT-compiler" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=label%3Abeta-nominated+label%3AT-compiler">beta nominations</a></p>



<a name="194309307"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309307" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309307">(Apr 16 2020 at 14:07)</a>:</h4>
<p>beta-nom 1/1: "Do not reuse post LTO products when exports change" <a href="https://github.com/rust-lang/rust/pull/71131" title="https://github.com/rust-lang/rust/pull/71131">#71131</a></p>



<a name="194309484"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309484" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309484">(Apr 16 2020 at 14:09)</a>:</h4>
<p>oh</p>



<a name="194309485"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309485" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309485">(Apr 16 2020 at 14:09)</a>:</h4>
<p>what's up with the perf results at the end?</p>



<a name="194309495"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309495" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309495">(Apr 16 2020 at 14:09)</a>:</h4>
<p>actually I have an opinion on this</p>



<a name="194309556"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309556" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309556">(Apr 16 2020 at 14:09)</a>:</h4>
<p>I started building a pair of compilers last night to investigate the perf issues</p>



<a name="194309570"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309570" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309570">(Apr 16 2020 at 14:09)</a>:</h4>
<p>but haven't had a chance to do the investigation yet</p>



<a name="194309598"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309598" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309598">(Apr 16 2020 at 14:09)</a>:</h4>
<p>The perf results "only" affect incremental compilation</p>



<a name="194309679"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309679" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309679">(Apr 16 2020 at 14:10)</a>:</h4>
<p>so the question is: Is it worth landing a bug fix like this that has some amount of performance regression?</p>



<a name="194309714"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309714" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309714">(Apr 16 2020 at 14:10)</a>:</h4>
<p>or are we better off waiting a bit longer</p>



<a name="194309725"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309725" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309725">(Apr 16 2020 at 14:10)</a>:</h4>
<p>so that I have time to investigate</p>



<a name="194309748"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309748" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309748">(Apr 16 2020 at 14:10)</a>:</h4>
<p>I think it only affects incremental compilation when certain kinds of code is added/removed</p>



<a name="194309758"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309758" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309758">(Apr 16 2020 at 14:10)</a>:</h4>
<p>I'd say yes, the perf tests affected are fairly artificial anyway</p>



<a name="194309780"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309780" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309780">(Apr 16 2020 at 14:10)</a>:</h4>
<p>and it seems to not affect <em>everything</em></p>



<a name="194309790"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309790" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309790">(Apr 16 2020 at 14:11)</a>:</h4>
<p>note how the big regressions are primarily "println"</p>



<a name="194309796"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309796" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309796">(Apr 16 2020 at 14:11)</a>:</h4>
<p><span class="user-mention silent" data-user-id="119009">eddyb</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194309748" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194309748">said</a>:</p>
<blockquote>
<p>I think it only affects incremental compilation when certain kinds of code is added/removed</p>
</blockquote>
<p>In at least one of the cases I was looking at, the only thing being added was a <code>{ }</code></p>



<a name="194309800"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309800" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309800">(Apr 16 2020 at 14:11)</a>:</h4>
<p>(OTOH, beta promotion is next week to stable)</p>



<a name="194309855"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309855" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309855">(Apr 16 2020 at 14:11)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> was that a 4% regression or a &gt;50% regression?</p>



<a name="194309865"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309865" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309865">(Apr 16 2020 at 14:11)</a>:</h4>
<p>the <code>{ }</code> thing may have been just noise; I do not know. Does perf do multiple runs, or just one?</p>



<a name="194309904"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309904" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309904">(Apr 16 2020 at 14:11)</a>:</h4>
<p>depends on the benchmark</p>



<a name="194309909"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309909" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309909">(Apr 16 2020 at 14:11)</a>:</h4>
<p>mostly 3</p>



<a name="194309923"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309923" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309923">(Apr 16 2020 at 14:11)</a>:</h4>
<p>(and takes min)</p>



<a name="194309983"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309983" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309983">(Apr 16 2020 at 14:12)</a>:</h4>
<p><span class="user-mention" data-user-id="119009">@eddyb</span> it was "patched incremental: is valid cap letter"</p>



<a name="194309996"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194309996" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194309996">(Apr 16 2020 at 14:12)</a>:</h4>
<p>in regex-opt</p>



<a name="194310028"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310028" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310028">(Apr 16 2020 at 14:12)</a>:</h4>
<p>which reported a 328.4% regression</p>



<a name="194310036"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310036" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310036">(Apr 16 2020 at 14:12)</a>:</h4>
<p>that <em>is</em> worrying, invalidates my hypothesis</p>



<a name="194310065"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310065" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310065">(Apr 16 2020 at 14:12)</a>:</h4>
<p><a href="https://github.com/rust-lang/rustc-perf/blob/master/collector/benchmarks/regex/1-is-valid-cap-letter.patch" title="https://github.com/rust-lang/rustc-perf/blob/master/collector/benchmarks/regex/1-is-valid-cap-letter.patch">https://github.com/rust-lang/rustc-perf/blob/master/collector/benchmarks/regex/1-is-valid-cap-letter.patch</a> for reference</p>



<a name="194310073"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310073" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310073">(Apr 16 2020 at 14:12)</a>:</h4>
<p>there's a possibility that the code I put in it itself expensive</p>



<a name="194310132"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310132" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310132">(Apr 16 2020 at 14:13)</a>:</h4>
<p><a href="https://perf.rust-lang.org/detailed-query.html?commit=c8085c9fa29609558b4745fc37c7a14c335e0ec3&amp;base_commit=edc02580e4e80476ac1ded2cc1008eaf8b8400e6&amp;benchmark=regex-opt&amp;run_name=patched%20incremental:%20is%20valid%20cap%20letter" title="https://perf.rust-lang.org/detailed-query.html?commit=c8085c9fa29609558b4745fc37c7a14c335e0ec3&amp;base_commit=edc02580e4e80476ac1ded2cc1008eaf8b8400e6&amp;benchmark=regex-opt&amp;run_name=patched%20incremental:%20is%20valid%20cap%20letter">https://perf.rust-lang.org/detailed-query.html?commit=c8085c9fa29609558b4745fc37c7a14c335e0ec3&amp;base_commit=edc02580e4e80476ac1ded2cc1008eaf8b8400e6&amp;benchmark=regex-opt&amp;run_name=patched%20incremental:%20is%20valid%20cap%20letter</a> looks like it's almost certainly adding new llvm modules</p>



<a name="194310148"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310148" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310148">(Apr 16 2020 at 14:13)</a>:</h4>
<p>namely, it does a set-equivalence test on two vectors by building hashsets, with some fast-paths for e.g. empty vecs or vecs with exact same contents</p>



<a name="194310194"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310194" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310194">(Apr 16 2020 at 14:13)</a>:</h4>
<p>its possible that the order of the elements in the vecs is happening to show up in a way here that makes the second fast path not applicable</p>



<a name="194310203"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310203" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310203">(Apr 16 2020 at 14:13)</a>:</h4>
<p><span class="user-mention" data-user-id="116122">@simulacrum</span> could it be the noise we just removed? should we just re-run try+perf?</p>



<a name="194310245"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310245" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310245">(Apr 16 2020 at 14:14)</a>:</h4>
<p>hm, I think no, but perhaps</p>



<a name="194310292"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310292" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310292">(Apr 16 2020 at 14:14)</a>:</h4>
<p><span class="user-mention" data-user-id="116122">@simulacrum</span> wait, how is <code>{ }</code> adding new llvm modules?</p>



<a name="194310308"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310308" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310308">(Apr 16 2020 at 14:14)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> no idea</p>



<a name="194310329"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310329" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310329">(Apr 16 2020 at 14:14)</a>:</h4>
<p>okay well we are getting in the weeds I guess</p>



<a name="194310335"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310335" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310335">(Apr 16 2020 at 14:14)</a>:</h4>
<p>that's just my assessment of 'what happened' based on the perf diff</p>



<a name="194310344"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310344" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310344">(Apr 16 2020 at 14:14)</a>:</h4>
<p>it's possible we're now doing LTO when we weren't before, or something like that..?</p>



<a name="194310353"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310353" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310353">(Apr 16 2020 at 14:14)</a>:</h4>
<p>anyway, I agree we should move on</p>



<a name="194310366"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310366" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310366">(Apr 16 2020 at 14:14)</a>:</h4>
<p>so the question comes back to: Should we land this, since it does fix a bug?</p>



<a name="194310368"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310368" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310368">(Apr 16 2020 at 14:14)</a>:</h4>
<p>though it's hard to tell what the outcome of this discussion is</p>



<a name="194310389"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310389" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310389">(Apr 16 2020 at 14:14)</a>:</h4>
<p>and just hope the perf issue gets addressed eventually, even if not in this release?</p>



<a name="194310404"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310404" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310404">(Apr 16 2020 at 14:15)</a>:</h4>
<p>(by that I mean: Should we land <em>and</em> backport to beta)</p>



<a name="194310420"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310420" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310420">(Apr 16 2020 at 14:15)</a>:</h4>
<p>hm, so these bugs are somewhat frequent I think in practice, and usually fixable with a cargo clean</p>



<a name="194310427"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310427" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310427">(Apr 16 2020 at 14:15)</a>:</h4>
<p>do we have an idea of how prevalent?</p>



<a name="194310436"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310436" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310436">(Apr 16 2020 at 14:15)</a>:</h4>
<p>I personally would be okay if the outcome here is "no, do not backport this"</p>



<a name="194310460"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310460" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310460">(Apr 16 2020 at 14:15)</a>:</h4>
<p>even though I hate when these bugs come up</p>



<a name="194310464"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310464" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310464">(Apr 16 2020 at 14:15)</a>:</h4>
<p>worth nothing that if we land now, it'll be in the beta quite quickly, so a perf fix may want to be backported</p>



<a name="194310504"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310504" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310504">(Apr 16 2020 at 14:15)</a>:</h4>
<p><span class="user-mention" data-user-id="116122">@simulacrum</span> indeed, I might even wait a week to land it in that case...</p>



<a name="194310512"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310512" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310512">(Apr 16 2020 at 14:15)</a>:</h4>
<p>(to nightly, that is)</p>



<a name="194310573"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310573" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310573">(Apr 16 2020 at 14:16)</a>:</h4>
<p>(started a second perf attempt just to see if it matches the first one)</p>



<a name="194310584"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310584" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310584">(Apr 16 2020 at 14:16)</a>:</h4>
<p>I think we should at least understand what is going wrong before backporting</p>



<a name="194310592"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310592" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310592">(Apr 16 2020 at 14:16)</a>:</h4>
<p>thanks <span class="user-mention" data-user-id="119009">@eddyb</span></p>



<a name="194310613"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310613" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310613">(Apr 16 2020 at 14:16)</a>:</h4>
<p>I think I would lean toward backporting because I think a perf regression is better than the bug. But additional investigation into the performance would be great.</p>



<a name="194310639"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310639" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310639">(Apr 16 2020 at 14:16)</a>:</h4>
<p>Anyone else in <span class="user-mention" data-user-id="125250">@Wesley Wiser</span> 's camp here?</p>



<a name="194310652"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310652" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310652">(Apr 16 2020 at 14:16)</a>:</h4>
<p>reading comments from the issue, I see that <span class="user-mention" data-user-id="125294">@Aaron Hill</span> noted:</p>
<blockquote>
<p>Extend the check added in <a href="https://github.com/rust-lang/rust/issues/67020" title="https://github.com/rust-lang/rust/issues/67020">#67020</a> to rebuild both the 'importer' and 'importee' when the import map changes. That is, if module 'A' starts/stops importing from module 'B', we rebuild both A and B. This is a broader change than 1), and should hopefully continue to work even if LLVM gets 'smarter'. <strong>However, it could cause us to unnecessarily re-run codegen for some modules, which could have a significant performance impact.</strong></p>
</blockquote>
<p>(emphasis mine)</p>



<a name="194310656"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310656" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310656">(Apr 16 2020 at 14:16)</a>:</h4>
<p>isn't the bug longstanding?</p>



<a name="194310662"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310662" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310662">(Apr 16 2020 at 14:16)</a>:</h4>
<p>The bug <em>is</em> pretty nasty</p>



<a name="194310672"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310672" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310672">(Apr 16 2020 at 14:16)</a>:</h4>
<p>when it arises...</p>



<a name="194310685"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310685" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310685">(Apr 16 2020 at 14:17)</a>:</h4>
<p>is this exclusively affecting incremental?</p>



<a name="194310706"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310706" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310706">(Apr 16 2020 at 14:17)</a>:</h4>
<p>yeah, seems to be just incr</p>



<a name="194310709"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310709" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310709">(Apr 16 2020 at 14:17)</a>:</h4>
<p>i.e., the difference is that some incremental builds get slower (maybe quite a bit)</p>



<a name="194310723"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310723" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310723">(Apr 16 2020 at 14:17)</a>:</h4>
<p>versus doing horrible things?</p>



<a name="194310741"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310741" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310741">(Apr 16 2020 at 14:17)</a>:</h4>
<p>Yes I believe all the perf regressions are just on incremental. As are the horrible things.</p>



<a name="194310751"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310751" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310751">(Apr 16 2020 at 14:17)</a>:</h4>
<p>I think I'm with <span class="user-mention" data-user-id="125250">@Wesley Wiser</span> too that I'd prefer the compiler takes longer but rebuilds everything that has to be rebuilt :P</p>



<a name="194310755"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310755" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310755">(Apr 16 2020 at 14:17)</a>:</h4>
<p>but link failures are pretty frustrating</p>



<a name="194310764"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310764" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310764">(Apr 16 2020 at 14:17)</a>:</h4>
<p>The linked issue makes it sound like the visible effect of the bug is new even if the underlying bug itself is old.</p>



<a name="194310769"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310769" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310769">(Apr 16 2020 at 14:17)</a>:</h4>
<p>Yeah I'd be in favor of landing I think</p>



<a name="194310787"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310787" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310787">(Apr 16 2020 at 14:17)</a>:</h4>
<p>er, backporting</p>



<a name="194310793"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310793" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310793">(Apr 16 2020 at 14:17)</a>:</h4>
<p>but I do think it's worth investigating to be able to say concretely what is going wrong</p>



<a name="194310849"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310849" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310849">(Apr 16 2020 at 14:18)</a>:</h4>
<p>I will definitely investigate the performance issue</p>



<a name="194310851"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310851" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310851">(Apr 16 2020 at 14:18)</a>:</h4>
<p>presuming <span class="user-mention" data-user-id="116083">@pnkfelix</span> can investigate and confirm that this is "unfortunate but expected"</p>



<a name="194310857"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310857" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310857">(Apr 16 2020 at 14:18)</a>:</h4>
<p>(not necessarily before landing)</p>



<a name="194310873"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310873" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310873">(Apr 16 2020 at 14:18)</a>:</h4>
<p>it fits well with other work I'm doing</p>



<a name="194310908"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310908" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310908">(Apr 16 2020 at 14:18)</a>:</h4>
<p>I'd also like it in nightly asap if it's going to hit stable next week, fwiw</p>



<a name="194310956"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310956" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310956">(Apr 16 2020 at 14:18)</a>:</h4>
<p>okay its basically already been r+'ed, I think, since I added the changes that <span class="user-mention" data-user-id="123586">@nagisa</span> asked for.</p>



<a name="194310976"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194310976" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194310976">(Apr 16 2020 at 14:19)</a>:</h4>
<p>lets move along then</p>



<a name="194311017"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311017" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311017">(Apr 16 2020 at 14:19)</a>:</h4>
<p>no stable nominations this week</p>



<a name="194311048"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311048" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311048">(Apr 16 2020 at 14:19)</a>:</h4>
<h2>PR's S-waiting-on-team</h2>



<a name="194311074"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311074" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311074">(Apr 16 2020 at 14:19)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/pulls?utf8=%E2%9C%93&amp;q=is%3Aopen+label%3AS-waiting-on-team+label%3AT-compiler+" title="https://github.com/rust-lang/rust/pulls?utf8=%E2%9C%93&amp;q=is%3Aopen+label%3AS-waiting-on-team+label%3AT-compiler+">T-compiler S-waiting-on-team</a></p>



<a name="194311090"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311090" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311090">(Apr 16 2020 at 14:19)</a>:</h4>
<ul>
<li>"Add Option to Force Unwind Tables" <a href="https://github.com/rust-lang/rust/pull/69984" title="https://github.com/rust-lang/rust/pull/69984">#69984</a> <ul>
<li>In FCP, Disposition to merge.</li>
</ul>
</li>
</ul>



<a name="194311168"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311168" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311168">(Apr 16 2020 at 14:20)</a>:</h4>
<ul>
<li>"A big options clean-up" <a href="https://github.com/rust-lang/rust/pull/70729" title="https://github.com/rust-lang/rust/pull/70729">#70729</a><ul>
<li>In FCP, disposition to merge.</li>
</ul>
</li>
</ul>



<a name="194311196"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311196" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311196">(Apr 16 2020 at 14:20)</a>:</h4>
<p>(the above are just reminders to check boxes if you haven't already. I need to do so.)</p>



<a name="194311214"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311214" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311214">(Apr 16 2020 at 14:20)</a>:</h4>
<ul>
<li>"Remove -Z no-landing-pads flag" <a href="https://github.com/rust-lang/rust/pull/70175" title="https://github.com/rust-lang/rust/pull/70175">#70175</a><ul>
<li>FCP finished, disposition to merge.</li>
</ul>
</li>
</ul>



<a name="194311347"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311347" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311347">(Apr 16 2020 at 14:21)</a>:</h4>
<p>(hmm, shouldn't thinks with a finished FCP be no longer marked S-waiting-on-team? I guess its just a matter of figuring out if it needs further review?)</p>



<a name="194311423"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311423" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311423">(Apr 16 2020 at 14:22)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116083">pnkfelix</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194311196" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194311196">said</a>:</p>
<blockquote>
<p>(the above are just reminders to check boxes if you haven't already. I need to do so.)</p>
</blockquote>
<p>oops, I misunderstood the text in the agenda.</p>



<a name="194311440"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311440" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311440">(Apr 16 2020 at 14:22)</a>:</h4>
<p>there weren't any boxes to check even</p>



<a name="194311540"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311540" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311540">(Apr 16 2020 at 14:23)</a>:</h4>
<ul>
<li>"Move LLVM bitcode destination" <a href="https://github.com/rust-lang/rust/pull/70458" title="https://github.com/rust-lang/rust/pull/70458">#70458</a><ul>
<li>FCP finished, disposition to merge and needs a reviewer.</li>
</ul>
</li>
</ul>



<a name="194311633"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311633" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311633">(Apr 16 2020 at 14:24)</a>:</h4>
<p>It looks like alex reviewed before</p>



<a name="194311634"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311634" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311634">(Apr 16 2020 at 14:24)</a>:</h4>
<p>(which to me looks like another case where the S-waiting-on-team label is not quite appropriate? Unless I suppose its the team's job to identify a reviewer ...)</p>



<a name="194311818"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311818" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311818">(Apr 16 2020 at 14:25)</a>:</h4>
<p>should we see if <span class="user-mention" data-user-id="116015">@Alex Crichton</span> wants to review again?</p>



<a name="194311827"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311827" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311827">(Apr 16 2020 at 14:25)</a>:</h4>
<p>can ping them</p>



<a name="194311856"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311856" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311856">(Apr 16 2020 at 14:25)</a>:</h4>
<p>they looked at it recently</p>



<a name="194311865"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311865" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311865">(Apr 16 2020 at 14:25)</a>:</h4>
<p>commented like yesterday</p>



<a name="194311876"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311876" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311876">(Apr 16 2020 at 14:25)</a>:</h4>
<p>right</p>



<a name="194311968"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311968" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311968">(Apr 16 2020 at 14:26)</a>:</h4>
<p>it's not a big change</p>



<a name="194311975"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311975" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311975">(Apr 16 2020 at 14:26)</a>:</h4>
<p>with "needs a reviewer" we meant, nobody is assigned to it</p>



<a name="194311983"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194311983" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194311983">(Apr 16 2020 at 14:26)</a>:</h4>
<p>oh, well, I take that back</p>



<a name="194312093"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312093" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312093">(Apr 16 2020 at 14:27)</a>:</h4>
<p>yeah I don't think we should mark this as owned by <span class="user-mention" data-user-id="116015">@Alex Crichton</span> , given that they've stepped back from the project to some degree</p>



<a name="194312140"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312140" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312140">(Apr 16 2020 at 14:27)</a>:</h4>
<p>I'll take it, and either review it or delegate</p>



<a name="194312166"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312166" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312166">(Apr 16 2020 at 14:27)</a>:</h4>
<p>okay lets move along</p>



<a name="194312184"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312184" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312184">(Apr 16 2020 at 14:28)</a>:</h4>
<h2>Issues of Note</h2>



<a name="194312234"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312234" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312234">(Apr 16 2020 at 14:28)</a>:</h4>
<ul>
<li><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-critical+" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-critical+">1 P-critical issues</a> (1 more than last week)</li>
</ul>



<a name="194312324"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312324" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312324">(Apr 16 2020 at 14:28)</a>:</h4>
<p>P-critical: <code>static FOO:Foo=FOO;</code> doesn't cause cycle error for zero-sized-type with no public constructor. <a href="https://github.com/rust-lang/rust/issues/71078" title="https://github.com/rust-lang/rust/issues/71078">#71078</a></p>



<a name="194312348"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312348" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312348">(Apr 16 2020 at 14:28)</a>:</h4>
<p>Looks like <span class="user-mention" data-user-id="124288">@oli</span> is investigating</p>



<a name="194312406"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312406" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312406">(Apr 16 2020 at 14:29)</a>:</h4>
<p>to be clear, this is not a fresh regression, AFAICT</p>



<a name="194312464"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312464" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312464">(Apr 16 2020 at 14:29)</a>:</h4>
<p>injected back in July of last year</p>



<a name="194312654"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312654" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312654">(Apr 16 2020 at 14:30)</a>:</h4>
<p>so this comes back to the question of what does P-critical mean</p>



<a name="194312694"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312694" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312694">(Apr 16 2020 at 14:31)</a>:</h4>
<p>This particular bug is certainly not a release blocker</p>



<a name="194312706"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312706" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312706">(Apr 16 2020 at 14:31)</a>:</h4>
<p>since it was injected so long ago</p>



<a name="194312760"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312760" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312760">(Apr 16 2020 at 14:31)</a>:</h4>
<p>So the the obvious question to me is: Do we wish to revisit this bug every week?</p>



<a name="194312809"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312809" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312809">(Apr 16 2020 at 14:31)</a>:</h4>
<p>There was discussion of that around <a href="#narrow/stream/227806-t-compiler.2Fwg-prioritization/topic/I-prioritize.20.2371078.20.60static.20FOO.3AFoo.3DFOO.3B.60.20doesn't.20cause.20cycl/near/193912866" title="#narrow/stream/227806-t-compiler.2Fwg-prioritization/topic/I-prioritize.20.2371078.20.60static.20FOO.3AFoo.3DFOO.3B.60.20doesn't.20cause.20cycl/near/193912866">https://rust-lang.zulipchat.com/#narrow/stream/227806-t-compiler.2Fwg-prioritization/topic/I-prioritize.20.2371078.20.60static.20FOO.3AFoo.3DFOO.3B.60.20doesn't.20cause.20cycl/near/193912866</a></p>



<a name="194312818"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312818" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312818">(Apr 16 2020 at 14:31)</a>:</h4>
<p>we gave the definition of potentially release blocker, like something that should probably be reviewed often but may or may not block the release</p>



<a name="194312871"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194312871" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194312871">(Apr 16 2020 at 14:32)</a>:</h4>
<p>the comments do contain a "weaponized" variant</p>



<a name="194313038"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313038" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313038">(Apr 16 2020 at 14:33)</a>:</h4>
<p>(Feedback about this decision from #t-compiler/wg-prioritization is certainly welcome <span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span> )</p>



<a name="194313050"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313050" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313050">(Apr 16 2020 at 14:33)</a>:</h4>
<p>the reasoning in that thread makes sense to me</p>



<a name="194313051"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313051" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313051">(Apr 16 2020 at 14:33)</a>:</h4>
<p>anyway as stated</p>



<a name="194313063"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313063" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313063">(Apr 16 2020 at 14:33)</a>:</h4>
<p><span class="user-mention" data-user-id="124288">@oli</span> is looking at it</p>



<a name="194313085"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313085" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313085">(Apr 16 2020 at 14:33)</a>:</h4>
<p>So I guess we'll keep our eye on it</p>



<a name="194313215"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313215" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313215">(Apr 16 2020 at 14:34)</a>:</h4>
<p>here is a summary of all the issues of note (as <a href="https://hackmd.io/eNrDT32CTBmGxOqIb6g3Lw?both#Issues-of-Note" title="https://hackmd.io/eNrDT32CTBmGxOqIb6g3Lw?both#Issues-of-Note">posted in agenda</a> as well):</p>
<ul>
<li><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-critical+" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-critical+">1 P-critical issues</a> (1 more than last week)</li>
<li><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+">45 P-high issues</a> (4 less than last week)<ul>
<li><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+no%3Aassignee" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+no%3Aassignee">26 of those are unassigned</a> (1 less than last week)</li>
</ul>
</li>
<li><a href="https://github.com/rust-lang/rust/labels/regression-from-stable-to-beta" title="https://github.com/rust-lang/rust/labels/regression-from-stable-to-beta">2 P-high and 2 P-medium regression-from-stable-to-beta</a><ul>
<li>The 2 P-medium are unassigned</li>
</ul>
</li>
<li><a href="https://github.com/rust-lang/rust/labels/regression-from-stable-to-nightly" title="https://github.com/rust-lang/rust/labels/regression-from-stable-to-nightly">2 P-high, 2 P-medium and 1 T-rustdoc regression-from-stable-to-nightly</a><ul>
<li>All of them are unassigned</li>
</ul>
</li>
</ul>



<a name="194313286"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313286" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313286">(Apr 16 2020 at 14:34)</a>:</h4>
<p>note that there are unassigned regressions</p>



<a name="194313328"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313328" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313328">(Apr 16 2020 at 14:34)</a>:</h4>
<p>in particular 2 P-high stable to nightly</p>



<a name="194313477"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313477" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313477">(Apr 16 2020 at 14:35)</a>:</h4>
<p>so yeah, lets at least list the unassigned P-high regressions</p>



<a name="194313589"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313589" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313589">(Apr 16 2020 at 14:36)</a>:</h4>
<p>the first one we've discussed before: Compile regression "cannot infer an appropriate lifetime for lifetime parameter" <a href="https://github.com/rust-lang/rust/issues/70917" title="https://github.com/rust-lang/rust/issues/70917">#70917</a></p>



<a name="194313600"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313600" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313600">(Apr 16 2020 at 14:36)</a>:</h4>
<p>It seems like Compile regression "cannot infer an appropriate lifetime for lifetime parameter" <a href="https://github.com/rust-lang/rust/issues/70917" title="https://github.com/rust-lang/rust/issues/70917">#70917</a>  may want to be P-critical</p>



<a name="194313649"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313649" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313649">(Apr 16 2020 at 14:36)</a>:</h4>
<p>At least the last few comments from <span class="user-mention" data-user-id="119009">@eddyb</span> and I were trending in that direction</p>



<a name="194313650"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313650" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313650">(Apr 16 2020 at 14:36)</a>:</h4>
<p>lets up priority on that, yeah</p>



<a name="194313673"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313673" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313673">(Apr 16 2020 at 14:37)</a>:</h4>
<p>we definitely want to address this in time for the release next week</p>



<a name="194313696"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313696" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313696">(Apr 16 2020 at 14:37)</a>:</h4>
<p><span class="user-mention" data-user-id="119009">@eddyb</span> do you think that you can prep a PR?</p>



<a name="194313705"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313705" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313705">(Apr 16 2020 at 14:37)</a>:</h4>
<p>I could also do it</p>



<a name="194313712"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313712" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313712">(Apr 16 2020 at 14:37)</a>:</h4>
<p>to revert the behavior?</p>



<a name="194313724"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313724" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313724">(Apr 16 2020 at 14:37)</a>:</h4>
<p>For lifetimes, right</p>



<a name="194313758"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313758" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313758">(Apr 16 2020 at 14:37)</a>:</h4>
<p>yeah I'll look into it. not even sure which "outlives"-named thing in the compiler caused it :P</p>



<a name="194313844"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313844" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313844">(Apr 16 2020 at 14:38)</a>:</h4>
<p>to be clear, we are thinking we may want to land this, but in a more gradual way, e.g. with a future-incompat cycle?</p>



<a name="194313884"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313884" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313884">(Apr 16 2020 at 14:38)</a>:</h4>
<p>Or wait, the comments say we may want to allow it</p>



<a name="194313887"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313887" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313887">(Apr 16 2020 at 14:38)</a>:</h4>
<p>or not at all, we might want to go the other direction and ignore types too</p>



<a name="194313895"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313895" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313895">(Apr 16 2020 at 14:38)</a>:</h4>
<p>I think maybe, though you could rationalize it</p>



<a name="194313907"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313907" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313907">(Apr 16 2020 at 14:38)</a>:</h4>
<p>gotcha, okay</p>



<a name="194313950"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313950" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313950">(Apr 16 2020 at 14:38)</a>:</h4>
<p>Okay well in any case</p>



<a name="194313951"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313951" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313951">(Apr 16 2020 at 14:38)</a>:</h4>
<p>the other unassigned is "file not found for module" <a href="https://github.com/rust-lang/rust/issues/70314" title="https://github.com/rust-lang/rust/issues/70314">#70314</a></p>



<a name="194313977"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313977" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313977">(Apr 16 2020 at 14:39)</a>:</h4>
<p>can I assign <a href="https://github.com/rust-lang/rust/issues/70917" title="https://github.com/rust-lang/rust/issues/70917">#70917</a> to <span class="user-mention" data-user-id="119009">@eddyb</span> ?</p>



<a name="194313999"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194313999" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194313999">(Apr 16 2020 at 14:39)</a>:</h4>
<p>or should I give it to <span class="user-mention" data-user-id="116009">@nikomatsakis</span> ?</p>



<a name="194314021"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314021" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314021">(Apr 16 2020 at 14:39)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116266">Santiago Pastorino</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194313951" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194313951">said</a>:</p>
<blockquote>
<p>the other one is "file not found for module" <a href="https://github.com/rust-lang/rust/issues/70314" title="https://github.com/rust-lang/rust/issues/70314">#70314</a></p>
</blockquote>
<p>ah yeah, so we got that narrowed down, but we would need someone to investigate</p>



<a name="194314038"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314038" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314038">(Apr 16 2020 at 14:39)</a>:</h4>
<p>okay <span class="user-mention" data-user-id="119009">@eddyb</span> already said they'd look at it</p>



<a name="194314051"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314051" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314051">(Apr 16 2020 at 14:39)</a>:</h4>
<p>yeah give it to me</p>



<a name="194314076"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314076" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314076">(Apr 16 2020 at 14:39)</a>:</h4>
<p><span class="user-mention" data-user-id="116009">@nikomatsakis</span> hmm maybe <span class="user-mention" data-user-id="123856">@Vadim Petrochenkov</span>? if they have time for it</p>



<a name="194314157"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314157" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314157">(Apr 16 2020 at 14:40)</a>:</h4>
<p>Worth pinging them.</p>



<a name="194314169"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314169" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314169">(Apr 16 2020 at 14:40)</a>:</h4>
<p>It's kind of an interesting area of the code that I'd like to understand better</p>



<a name="194314200"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314200" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314200">(Apr 16 2020 at 14:40)</a>:</h4>
<p>wish I had time, but I think I probably don't</p>



<a name="194314328"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314328" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314328">(Apr 16 2020 at 14:41)</a>:</h4>
<p>As noted, there were a bunch of other issues in the summary</p>



<a name="194314393"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314393" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314393">(Apr 16 2020 at 14:41)</a>:</h4>
<p>but we've covered the unassigned P-high (or above) regressions, and that's really all we have time for.</p>



<a name="194314444"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314444" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314444">(Apr 16 2020 at 14:42)</a>:</h4>
<p>So lets move on to nominated issues</p>



<a name="194314485"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314485" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314485">(Apr 16 2020 at 14:42)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3AI-nominated+label%3AT-compiler" title="https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3AI-nominated+label%3AT-compiler">T-compiler I-nominated</a></p>



<a name="194314537"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314537" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314537">(Apr 16 2020 at 14:42)</a>:</h4>
<ul>
<li>nom 1/3: "[WIP] Rename mir::Rvalue to Op." <a href="https://github.com/rust-lang/rust/issues/70928" title="https://github.com/rust-lang/rust/issues/70928">#70928</a><ul>
<li>In FCP, disposition to close.</li>
</ul>
</li>
</ul>



<a name="194314643"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314643" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314643">(Apr 16 2020 at 14:43)</a>:</h4>
<p>(so just check your boxes and we can close it once enough are checked.)</p>



<a name="194314680"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314680" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314680">(Apr 16 2020 at 14:43)</a>:</h4>
<ul>
<li>nom 2/3: "Should enum discriminants have generics in scope?" <a href="https://github.com/rust-lang/rust/issues/70453" title="https://github.com/rust-lang/rust/issues/70453">#70453</a><ul>
<li>In FCP, disposition to merge.</li>
</ul>
</li>
</ul>



<a name="194314681"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314681" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314681">(Apr 16 2020 at 14:43)</a>:</h4>
<p>seems pretty clear that <code>Op</code> is not favored</p>



<a name="194314742"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314742" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314742">(Apr 16 2020 at 14:44)</a>:</h4>
<p>(yeah maybe I should just bypass the FCP on <a href="https://github.com/rust-lang/rust/issues/70928" title="https://github.com/rust-lang/rust/issues/70928">#70928</a> at this point. it doesn't seem like anyone is going to fight in favor of it at this point...?)</p>



<a name="194314795"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314795" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314795">(Apr 16 2020 at 14:44)</a>:</h4>
<p>(I'll think about that.)</p>



<a name="194314807"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314807" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314807">(Apr 16 2020 at 14:44)</a>:</h4>
<p>that's a lang FCP, ping <span class="user-mention" data-user-id="127859">@Taylor Cramer</span> <span class="user-mention" data-user-id="125270">@scottmcm</span> and <span class="user-mention" data-user-id="256759">@boats</span> on <a href="https://github.com/rust-lang/rust/issues/70453" title="https://github.com/rust-lang/rust/issues/70453">#70453</a></p>



<a name="194314847"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314847" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314847">(Apr 16 2020 at 14:44)</a>:</h4>
<p>/me once against shakes his fist at the labelling system</p>



<a name="194314977"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194314977" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194314977">(Apr 16 2020 at 14:45)</a>:</h4>
<p>do other teams get annoyed by this? Would we have buy in to delete I-nominated and replace it with separate nomination labels for each team?</p>



<a name="194315016"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315016" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315016">(Apr 16 2020 at 14:45)</a>:</h4>
<p>there's <code>Centril added T-compiler I-nominated</code> at the very end, so I was guessing some kind of intervention by the compiler team was expected?</p>



<a name="194315060"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315060" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315060">(Apr 16 2020 at 14:45)</a>:</h4>
<p>I'm not sure what</p>



<a name="194315123"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315123" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315123">(Apr 16 2020 at 14:46)</a>:</h4>
<p>I think centril removed T-compiler to start FCP then added it back, not sure where the nominated came from, maybe from the fcp itself</p>



<a name="194315127"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315127" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315127">(Apr 16 2020 at 14:46)</a>:</h4>
<p>me neither, anyway, at least if it serves the purpose of just notifying some people ... :/</p>



<a name="194315154"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315154" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315154">(Apr 16 2020 at 14:46)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> I agree <code>Op</code> is suboptimal, but I'm curious in what venue we might bikeshed alternatives</p>



<a name="194315197"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315197" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315197">(Apr 16 2020 at 14:46)</a>:</h4>
<p>Nominated 21 days ago <a href="https://github.com/rust-lang/rust/issues/70453#event-3170661280" title="https://github.com/rust-lang/rust/issues/70453#event-3170661280">https://github.com/rust-lang/rust/issues/70453#event-3170661280</a></p>



<a name="194315235"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315235" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315235">(Apr 16 2020 at 14:46)</a>:</h4>
<p><span class="user-mention" data-user-id="119009">@eddyb</span> hmm. I wish I could say the answer to that is obvious</p>



<a name="194315246"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315246" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315246">(Apr 16 2020 at 14:46)</a>:</h4>
<p>heh</p>



<a name="194315263"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315263" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315263">(Apr 16 2020 at 14:47)</a>:</h4>
<p>obviously <em>I</em> think Zulip is the answer</p>



<a name="194315274"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315274" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315274">(Apr 16 2020 at 14:47)</a>:</h4>
<p>I'm fine if there isn't an answer but It'd be sad to leave it hanging for another two years</p>



<a name="194315285"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315285" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315285">(Apr 16 2020 at 14:47)</a>:</h4>
<p>but I know that is not the ideal platform for some</p>



<a name="194315317"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315317" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315317">(Apr 16 2020 at 14:47)</a>:</h4>
<p>(since I'll surely forget in a second the moment this is closed)</p>



<a name="194315374"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315374" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315374">(Apr 16 2020 at 14:47)</a>:</h4>
<ul>
<li>nom 3/3: "Add support for parsing with rust-analyzer instead of librustc_parse <a href="https://github.com/rust-lang/rust/issues/70761" title="https://github.com/rust-lang/rust/issues/70761"><a href="https://github.com/rust-lang/rust/issues/70761" title="https://github.com/rust-lang/rust/issues/70761"><a href="https://github.com/rust-lang/rust/issues/70761" title="https://github.com/rust-lang/rust/issues/70761">#70761</a></a></a>" <a href="https://github.com/rust-lang/rust/pull/70761" title="https://github.com/rust-lang/rust/pull/70761">#70761</a><ul>
<li>Nominated for discussion, maybe needs an MCP.</li>
</ul>
</li>
</ul>



<a name="194315454"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315454" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315454">(Apr 16 2020 at 14:48)</a>:</h4>
<p>holy cow that totally needs an MCP, no?</p>



<a name="194315490"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315490" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315490">(Apr 16 2020 at 14:48)</a>:</h4>
<p>it's a very experimental thing IIUC but that was my guess</p>



<a name="194315545"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315545" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315545">(Apr 16 2020 at 14:48)</a>:</h4>
<p>I didn't think that was meant to land</p>



<a name="194315581"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315581" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315581">(Apr 16 2020 at 14:48)</a>:</h4>
<p>but if it is then yes :)</p>



<a name="194315668"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315668" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315668">(Apr 16 2020 at 14:49)</a>:</h4>
<p>It's certainly an interesting data point in the "unify the parser" space</p>



<a name="194315713"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315713" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315713">(Apr 16 2020 at 14:49)</a>:</h4>
<p>okay so does that mean we close the PR and tell them to make an MCP? Or leave the PR open and tell them it needs to go through MCP process before it can be reviewed?</p>



<a name="194315722"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315722" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315722">(Apr 16 2020 at 14:49)</a>:</h4>
<p>we now have 3 handwritten parsers (<code>rustc_parser</code>, <code>syn</code> and RA) and 1 grammar sort-of-usable for parsing (<code>wg-grammar</code>), right?</p>



<a name="194315787"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315787" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315787">(Apr 16 2020 at 14:50)</a>:</h4>
<p>(although <code>wg-grammar</code> has stalled on account on me not having the time to work on the grammar framework...)</p>



<a name="194315809"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315809" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315809">(Apr 16 2020 at 14:50)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116083">pnkfelix</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194315713" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194315713">said</a>:</p>
<blockquote>
<p>okay so does that mean we close the PR and tell them to make an MCP? Or leave the PR open and tell them it needs to go through MCP process before it can be reviewed?</p>
</blockquote>
<p>the RFC says you can close</p>



<a name="194315821"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315821" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315821">(Apr 16 2020 at 14:50)</a>:</h4>
<p>okay</p>



<a name="194315841"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315841" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315841">(Apr 16 2020 at 14:50)</a>:</h4>
<p>Maybe we should just ask the author what their intent for this was? If this is just a cool proof of concept, we can close. Otherwise they should file a MCP.</p>



<a name="194315846"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315846" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315846">(Apr 16 2020 at 14:50)</a>:</h4>
<p>I'll take care of that after the meeting.</p>



<a name="194315867"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315867" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315867">(Apr 16 2020 at 14:50)</a>:</h4>
<p><span class="user-mention" data-user-id="133169">@matklad</span> left some useful comments at the end</p>



<a name="194315938"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194315938" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194315938">(Apr 16 2020 at 14:51)</a>:</h4>
<p>(it sounds like we can close it either way, and let the author take the next steps. but I want to make sure I get the language right in my  comment, because I do not want to discourage the author from taking further steps...)</p>



<a name="194316001"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316001" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316001">(Apr 16 2020 at 14:51)</a>:</h4>
<p>If anyone present at this meeting thinks they would be interested and <em>have time</em> to review such a PR, definitely reach out (either on the PR itself, or ping me)</p>



<a name="194316009"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316009" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316009">(Apr 16 2020 at 14:51)</a>:</h4>
<p>(or just say so here)</p>



<a name="194316105"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316105" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316105">(Apr 16 2020 at 14:52)</a>:</h4>
<p>Okay so now its WG check in time</p>



<a name="194316159"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316159" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316159">(Apr 16 2020 at 14:52)</a>:</h4>
<p>the checkin schedule is, as last week, a bit disrupted</p>



<a name="194316184"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316184" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316184">(Apr 16 2020 at 14:52)</a>:</h4>
<p>in that we are revisiting teams sooner than expected</p>



<a name="194316216"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316216" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316216">(Apr 16 2020 at 14:52)</a>:</h4>
<p><span class="user-mention" data-user-id="116009">@nikomatsakis</span> do you have anything to report from WG-meta?</p>



<a name="194316254"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316254" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316254">(Apr 16 2020 at 14:53)</a>:</h4>
<p>Yeah</p>



<a name="194316260"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316260" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316260">(Apr 16 2020 at 14:53)</a>:</h4>
<p><a href="https://hackmd.io/Q4Sa6M_2TwGqFed_y1G-VA?edit" title="https://hackmd.io/Q4Sa6M_2TwGqFed_y1G-VA?edit">Update:</a></p>
<h2>2020-04-16</h2>
<ul>
<li>Created <a href="https://github.com/rust-lang/rfcs/pull/2904" title="https://github.com/rust-lang/rfcs/pull/2904">RFC 2904</a>, for the major change process</li>
<li>
<p>Thinking about registering "areas" of the compiler, as an evolution of the "experts map":<br>
    * each would have a registered zulip stream<br>
    * also some list of experts / maintainers you can go to for help, or feedback on MCPs, etc<br>
    * would replace e.g. llvm, mir-opt, and a number of existing wgs</p>
</li>
<li>
<p>Also thinking about a "map" that will help steer contributors. So you want to do X...?<br>
    * X = fix a bug, rustbot claim, write a PR<br>
    * X = add a compiler flag, draft a description etc<br>
    * X = big refactoring, create an MCP<br>
    * etc</p>
</li>
</ul>



<a name="194316472"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316472" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316472">(Apr 16 2020 at 14:54)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116009">nikomatsakis</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194316260" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194316260">said</a>:</p>
<blockquote>
<ul>
<li>Also thinking about a "map" that will help steer contributors. So you want to do X...?</li>
</ul>
</blockquote>
<p>I love that! Really good idea!</p>



<a name="194316483"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316483" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316483">(Apr 16 2020 at 14:55)</a>:</h4>
<p>would these go on the forge? or on the compiler-team website?</p>



<a name="194316521"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316521" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316521">(Apr 16 2020 at 14:55)</a>:</h4>
<p>probably forge</p>



<a name="194316531"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316531" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316531">(Apr 16 2020 at 14:55)</a>:</h4>
<p>and linked from elsewhere</p>



<a name="194316553"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316553" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316553">(Apr 16 2020 at 14:55)</a>:</h4>
<p>but I'm entirely sure, I'd like to scope it out to the project as a whole eventually</p>



<a name="194316569"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316569" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316569">(Apr 16 2020 at 14:55)</a>:</h4>
<p>I'm in part wondering (once again) what diagramming facilities we currently have available</p>



<a name="194316573"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316573" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316573">(Apr 16 2020 at 14:55)</a>:</h4>
<p>I think <span class="user-mention" data-user-id="119009">@eddyb</span>'s suggestion to maybe e.g. auto link PRs touching some area of the compiler to a zulip stream could be interesting</p>



<a name="194316584"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316584" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316584">(Apr 16 2020 at 14:55)</a>:</h4>
<p>and whether we can improve upon them</p>



<a name="194316638"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316638" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316638">(Apr 16 2020 at 14:56)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116083">pnkfelix</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194316569" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194316569">said</a>:</p>
<blockquote>
<p>I'm in part wondering (once again) what diagramming facilities we currently have available</p>
</blockquote>
<p>I recently found that there is tooling to integrate mermaid into mdbook</p>



<a name="194316710"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316710" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316710">(Apr 16 2020 at 14:56)</a>:</h4>
<p><span class="user-mention" data-user-id="116122">@simulacrum</span> it would certainly remove random surprises where I find a change I would've wanted to review, days/weeks/months later, for a completely unrelated reason :P</p>



<a name="194316751"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316751" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316751">(Apr 16 2020 at 14:56)</a>:</h4>
<p>I was going to try and integrate it into <a href="http://rust-lang.github.io/chalk/book/" title="http://rust-lang.github.io/chalk/book/">the chalk book</a> to support docs like <a href="https://hackmd.io/RrTxVwW7TdeZUOAItYqgPg" title="https://hackmd.io/RrTxVwW7TdeZUOAItYqgPg">this view of how chalk works</a></p>



<a name="194316769"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316769" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316769">(Apr 16 2020 at 14:56)</a>:</h4>
<p>/me is upset that there is no <code>:mermaid:</code> emoji</p>



<a name="194316812"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316812" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316812">(Apr 16 2020 at 14:57)</a>:</h4>
<p>🧜‍♀️</p>



<a name="194316838"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316838" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316838">(Apr 16 2020 at 14:57)</a>:</h4>
<p>yeah cannot put that as a reaction though.</p>



<a name="194316902"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316902" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316902">(Apr 16 2020 at 14:57)</a>:</h4>
<p>we could add to forge, too, is the point :)</p>



<a name="194316917"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316917" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316917">(Apr 16 2020 at 14:58)</a>:</h4>
<p>and I would like to port the comiler-team website to mdbook</p>



<a name="194316969"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194316969" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194316969">(Apr 16 2020 at 14:58)</a>:</h4>
<p>mdbook all the things</p>



<a name="194317055"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194317055" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194317055">(Apr 16 2020 at 14:58)</a>:</h4>
<p>okay. sounds like something fun to look into</p>



<a name="194317206"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194317206" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194317206">(Apr 16 2020 at 14:59)</a>:</h4>
<p>As for WG-mir-opt, they are skipping checkin this week (because we heard from them recently)</p>



<a name="194317290"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194317290" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194317290">(Apr 16 2020 at 15:00)</a>:</h4>
<p>so that's all, folks! Now time for me to follow up on those post-meeting tasks I promised above. :)</p>



<a name="194317443"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194317443" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194317443">(Apr 16 2020 at 15:01)</a>:</h4>
<p>oh, right; Bye <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span> , you are all awesome. Stay safe, stay well.</p>



<a name="194321138"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-16%20%2354818/near/194321138" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818.html#194321138">(Apr 16 2020 at 15:22)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116009">nikomatsakis</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194315809" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194315809">said</a>:</p>
<blockquote>
<p><span class="user-mention silent" data-user-id="116083">pnkfelix</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194315713" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-16.20.2354818/near/194315713">said</a>:</p>
<blockquote>
<p>okay so does that mean we close the PR and tell them to make an MCP? Or leave the PR open and tell them it needs to go through MCP process before it can be reviewed?</p>
</blockquote>
<p>the RFC says you can close</p>
</blockquote>
<p>Ah, the RFC says "The PR should be closed or marked as blocked." I'm more inclined at the moment to do the latter.</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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